<!DOCTYPE html>
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
  <button>Toggle</button>
	<p>Hello</p>
	<p style="display: none">Good Bye</p>
	<script>
		$("button").click(function () {
			$("p").toggle();
		});
	</script>

</body>
</html>